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Heavy paint coating loss and localized corrosion of the Al alloy hull occur red after less than a year's service of a ship at sea.Examination and analysis showed that the Mg-basic sacrificial anodes originally used for cathodic protection were not suitable as the resulting -1.3V-plus (vs Ag/AgCl) protection potential for the hull was too negative for the purpose .A new protection system was designed in which the protection current densities were 15mA/m2 for the hull and 350mA/m2 for the propeller - The hull protection potential under actual condition at sea was between -920mV and - 1100mV (Ag/AgCl) and the protection efficiency was over 90% . The protection areas were calculated by using the formulas A=1.8×LBP×D+ BC× LB×B for the hull and As=2Aas for the propeller. 相似文献
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海水中的金属设施遭受海水腐蚀和附着生物的严重危害,通常采用阴极保护只能防止腐蚀而不能防止海生物附着,而防污涂料,防污期不过2—3年,又不能有效地防止腐蚀;再者,有些海洋设施不能使用涂料,如钻井船升降架和某些海防设施等。所以,寻找一种既能防腐蚀又能防生物附着的方法是非常必要的。利用电化学方法同时防止金属腐蚀和生物附着的想法,早在1863年就有人提出,但直到目前为止,仍处于研究阶段。我们于1976年参考文献〔2〕设计了一种恒电位-电解双防系统,在青岛中港码头进行了122天的海上试验,取得了防腐蚀和防附着的肯定效果。 相似文献
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The effect of trace elements Bi and Ti on the electrochemical property of aluminium sacrificial anode in seawater was studied . Different amounts of Bi and Ti were alloyed with Al-Zn-In to make 9 types of aluminium sacrificial anodes . Anode closed circuit potential, discharge capacities and current efficiencies were measured in the laboratory . The results show that the effect of Bi is greater than that of Ti. 相似文献
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为了防止海洋生物对海船、军舰、船坞、水下武器以及其他海上设备的有害附着，新的防污药品、防污涂料以及防污办法。正为许多学者所悉心研究；防污药品正逐渐地由无机物向有机物及放射性物质方面转变。但是，目前生产中广泛采用的仍然是无机毒品，防污涂料的防污效果与有效使用期限不但与药品的毒性有关，而且与药品在单位时间内自涂料膜渗出的剂量密切相关。如果单位时间内渗出剂量过大，则不经济，有效防污期限将大大缩短；如果单位时间内渗出剂量过小，则不能达到抑制生物附着和生长的目的。渗出率的大小常常是防污涂料的关键指标。因此渗出率的研究，不但能指导生产单位改进防污涂料的生产工艺，而且也为使用单位提供了选择和估价防污涂料的简单有效的方法。 相似文献
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